Means for stirring dyeing baths



July 29, 1952 A. wYssLlNG MEANS FOR STIRRING DYEING BATHS Filed June 19,1950 Patented July Y29, ,1952

y Y r 2,604,773

MEANS FOR STIRRING DYEING BATHS Arnold Wyssling, deceased, late ofBasel, Switzerland, by Lina Wyssling-Meier, administratrix,

Basel, Switzerland Application June 19, 1950, Serial No. 168,877 InSwitzerland May 6, 1949 (Cl. (iS-183) l Claim. i

In all cases where it is desired to proceed with the dyeing of samplesand the like on a large scale, it is found that the dyeing operationrequires a somewhat considerable expenditure in time and labor. becauseit is necessary to move by hand the material to be dyed inside the bathin order to obtain a uniform coloration.

Now it has been found, in accordance with the invention, that it ispossible to economize a considerable percentage of the labor involved byresorting to a simple apparatus for the stirring of the dyeing baths.Said apparatus introduces into the dyeing bath a continuous current ofgas in order to stir the liquid and material to beV dyed without itbeing any longer necessary to constantly inspect the operation. Theexecution of this method requires a particular arrangement including apipe for admitting gas into the bath, said arrangement being associatedpreferably With means for holding the material to be dyed and preventingit from rising inside the dyeing bath. Furthermore, it is of advantageto secure a cover onto the vat, said cover being attached to thegas-admitting pipe in order to prevent any liquid from overflowing andmore particularly any froth from running out of the vat.

The possibility thus achieved of dyeing perfectly even with dyestuffsthat are difiicult to distribute equally in a bath, forms an astonishingresult for anyone skilled in the art, as such a result could not bereached heretofore, otherwise than through a continuous mechanicalstirring of the material to be dyed.

My invention has for its object an apparatus for stirring or mixingdyeing baths according to which gas is fed into the dyeing bath througha tube leading to the vicinity of the bottom of said bath, the gasescaping then out of the end of the tube towards the free level of thebath in the shape of bubbles that provide an excellent stirring of thedyeing bath.

My invention has further for its object a device for stirring dyeingbaths comprising arpipe for feeding gas down to the bottom of the bathand terminating at its lower end with a distributing system providingfor a regular distribution of the gas.

I have described hereinafter with reference to accompanying drawings anembodiment of the invention selected by way of example.

In the single figure of said drawing, the dyeing vat l is drawn indot-and-dash lines. Said vat containing the dyeing bath carries adishshaped cover 2 through which the gas-feeding 2 pipe3 passes. Saidpipe extending down to the bottom of the vat, is provided at its lowerend with radial distributing pipes 3 provided each at its outer end withan opening 3 directed downwardly and forming a nozzle. At an adjustableheight inside the vat I the .gas-feeding pipe is provided with awheel-shaped member 4 that is intended for holding the material to bedyed, that is immersed in the bath, underneath it so that it may notrise inside the vat. This material-holding member 4 may as well beconstituted by a perforated disc or a grating made of wire. Thegas-feeding tube is also provided with a centering ring 5 secured to itand resting on the cover 2, said ring serving simultaneously as asuspension member for the pipe 3.

When it is desired to make use of the above described arrangement, thegas-feeding pipe is connected with a supply of compressed air and isintroduced into the vat l containing the dyeing bath as well as thetextile material to be dyed.

The air passing out of the nozzle 3 rises inside the dyeing bath andforms bubbles therein whereby the dyeing liquid is set into motion. Thisensures an excellent stirring of the bath and thereby a perfectlyuniform dyeing of the textile material. In the case where a dyeingliquid is used that shows a tendency to frothing, the froth collects onthe perforated cover 2 that is provided with a peripheral flangepreventing any overflowing of liquid or loss of froth. The air feedingthe pipe 3 may be cold or else it may be used after preheating in orderto avoid any undesired cooling of the hot dyeing bath. Instead of air,it is possible tomake use of nitrogen, which would be of particularinterest in the case where the dyeing liquid is sensitive to the actionof oxygen.

What is claimed is:

An arrangement for stirring dyeing baths contained in a vat comprising adish-shaped cover for said vat having an upstanding peripheral angethereon, said cover having perforations therein for the passage of frothout of the bath onto the cover and to be held thereon, an openingthrough said cover, a gas feeding pipe extending through said opening, acentering ring adjustably secured to said pipe and resting on saidcover, said centering ring constituting a suspension member for saidpipe, a plurality of radial horizontal pipes at the lower end of saidgas feeding vpipe having downwardly directed nozzle-shaped openings atthe outer ends thereof adapted for the passage therethrough of gas, saidradial pipe adapted for uniformly distributing gas inside the bath, anda vertically adjustable wheel-shaped member cn 3 said gas feeding pipebetween said cover end said UNITED STATES PATENTS radial pipes, saidWheel-shaped member being Number adapted to prevent material to be dyedfrom ris- 174 054 Augame Feb B22581876 ine ebeve the level ef Seidmembee 286'735 Rossle-:I oct'. 16' 1883 UNA WYSSHNG'MEIER 5 1,430,119savery sept. 26, 1922 Admlntstatl 0]e the Estate 0f ATTLOld WIJSS-1781052 Cat-,lett No 11 1930 1mg Deeeaeed Y 1,944,544 Cheney Jan. 23,1934 REFERENCES CITED. 2,051,441 Ellis 1-, Aug. 18, 1936 The followingreferences are of record in the 10 le of this patent:

